This BV9300 can support up to 12GB+9GB of extended memoryif you do not know how to set itplease open Settings > About Phone > Operation > Memoryset the memory you needand simply restart the phone after changing the settings to take effect.This  phone supports 18W quick charging.if you encounter any problems, you can directly contact our telephone customer service and send an email to our after-sales mailbox, we will reply you in the first time, Blackview company will further assist you to solve the problem, thank you

Email: support@blackview.hk

Telephone :

Germany: +49 157 3598 0115

UK :+44 7700 156388

Canada: +1 (587) 841-0500

USA: +1 (717) 896-6060

Friendly tip: please charge the  phone with the standard charger provided by us to avoid failure to reach the expected charging time due to incorrect protocol.